Figure 8.

The results for one of the healthy volunteers (Subject 9) where VIPH, respiratory RETROICOR regressors (RETRO) or RVT regressors were taken into account in the regression analyses. These regressors were used as predictors (b, d, f) or as confounders while the alpha power was the predictor (c, e, g). For comparison, (a) shows the correlation of the alpha power without any of these additional regressors taken into account. The same correlation is represented in (c), (e), and (g) with a white contour line. The yellow arrows in (c) point toward the significantly activated left and right parietal cortex, occipital cortex, and thalamus.